This user must have
permission privileges from the top (or root) of the disk partition or
operating system directory down to the specific physical device or operating
system file. Maintain consistent ownership and privileges for all files and
directories. A single user—the Sybase system administrator with read, write,
and execute permissions—should perform all installation, upgrade, and setup
tasks.
If you are installing Adaptive Server on more than one computer, create the "sybase" user account on each machine.